Diarrhea is much less common than constipation. Here's a previous thread with some ideas to fix diarrhea, but if you are using any artificial sweeteners, stop those ...that seems the most common reason.
https://forum.lowcarber.org/showthread.php?t=465335

Article on Keto Sweeteners, the best and worse. https://www.dietdoctor.com/low-carb/keto/sweeteners